Subtract 9/42 from 20/10, Solve 2 0/10

Subtract 9/42 from 20/10

1^st number: 2 0/10, 2^nd number: 9/42

20/10 - 9/42 is 25/14.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 10 × 21 = 210,
20/10 = 20 × 21/10 × 21 = 420/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
9/42 = 9 × 5/42 × 5 = 45/210
Subtract the two like fractions:
420/210 - 45/210 = 420 - 45/210 = 375/210
After reducing the fraction, the answer is 25/14
In mixed form: 111/14

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